Throttle-valve



(No ModeLj i i W. W. ST. JOHN.

THROTTLE VALVE.

No. 408,145. Patented July 30, 1889'.

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UNITED STATES PATENT OFFICE.

VILLIAM W. ST. JOHN, OF BROOKLYN, NET YORK.

TH ROTTLE-VALVE.

SPECIFICATION forming part 0f Letters Patent No. 408,145, dated July 30, 1889.

Application filed July 2, 1888. Serial No. 278,773. (No model.)

To a/ZZ whom it may concern:

Be it known that l, VVILLTAM NV. ST. JOHN, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Throttle-Valves; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the saine, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in throttle-valves for steam, gas, or other engines; and the objects of the invention are to construct a throttle-valve for engines of any kind, by which the iiow of the steam, gas, or other iiuid can be governed or regulated automatically, or by hand, in a more perfect manner than heretofore also, to prevent any possible leakage of the steam, gas, dac., as the valve is kept tight by suitable packing-rings; also, to facilitate the operation of the throttle-valve in an easy and expeditious manner; furthermore, to greatly simplify the construction and operation of the valve, as well as the fitting together, and thereby the cost of manufacturing it, and, finally, to produce a balanced valve not liable to get out of order, and therefore easier operated.

Vith these objects in view my invention consists in the peculiar construction of the details and the arrangement of parts, as will be more fully described hereinafter, and specifically pointed out in the claims, reference being had to the accompanying drawings and the letters of reference marked thereon.

Like letters indicate similar parts in the different figures of the drawings, in which- Figure l represents avertical section of my improved throttle-valve opened full. Fig. 2 is a horizontal section of the same on line x In the drawings, A represents the shell or main body of the valve, which is made of the middle or cent-ral part a and the two end pieces Z) and c, and said parts are accurately turned and fitted on their adjoining faces and securely bolted together by the bolts B, which pass through the lugs d. The central or middle part d is cored out to facilitate the admission of the steam around the valve, and the edges of the contact-faces are beveled off, as shown at a. The upper part?) is provided with a neck C, to which the head D is secured, and it has a suitable stuiiing-box E, through which the valve-stem e passes. The valvestem is connected to the valve F, which is of cylindrical form, and is provided with the openings f, forming the bridges g. The up per end has a boss 71 into which the valvestem is screwed. The lower part c of the shell has a neck N, whichis provided with a screwthread for attachment to an elbow G; or it may have a flange, as shown in broken lines 7i, to secure it to the steam-pipe. The central part a is'provided with a nozzle H for the outlet of the steam to the eng'ne, and it may be fitted with a screw-th read t', or with a flange, for connecting it to the line-pipe. The valve F may be operated by a lever attached to the fulcrum l (shown in broken lines) and secured in a lug K; or it may be operated by a handwheel on the valve-stem, which is then provided with a screw-thread in the stuffing-box or neck. The faces of the parts b and c are recessed out for the reception of the packingrings m and n., which bear with their inner peripheries against the outer face of the valve F. Said rings are forced against the valve by springs or steam, as desired, and they are forced against each other by a series of spiral springs 7a, placed in recesses in the parts b and c. Any other kind of packing-rings may, however, be employed, by which the cylindrical valve is thoroughly packed, to prevent leakage of steam, gas, &c.

If desired, the adjoining faces of the rings a, l), and c may be provided with V-shaped or other formed tongues and grooves, as shown in dotted lines in Fig. l, and the joints may be ground to make them perfectly tight. The different parts of the throttle-valve may be made of castircn, composition, steel, or other suitable material, and the valves may be made larger or smaller, according to circumstances or the requirements of the case. lf desired, flanges on the parts a b c may be employed, instead of the lugs d, and instead of the screwthreaded head l) it may be provided with fianges, to which to bolt the stufiing-box'E.

IOO

Having thus described 1ny invention, What I claim, and desire to secure by Letters Patent, 1s

l. A throttle-valve consisting of a central part and two end parts secured together, as shown, in combination with a hollow pistonvalve having openings for the passage of the fluid and its periphery packed by suitable packing-rings, arranged in the manner herein shown and set forth.

2. The throttle-valve herein described, consisting of the central .part a, the end parts bY and c, secured together by bolts B, in combination with the hollow piston-valve F, provided with openings f, and the packing-rings m and n, arranged in the manner shown, and for the purpose set forth.

3. The combination of the parts a b c, forming the shell A, the part b having a stuffingbox E, and the part c having the neck N, for attachment with the piston-valve F, having openings through its periphery, which moves through packing-rin gs m n, placed in recesses in the shell, as herein shown and set forth.

' In testimony whereof I affix my signature in presence of two Witnesses.

VILLIAM WV. ST. JOHN.

Vi tn esses:

T. C. BRECHT, H. A. BRECHT. 

